Today, it is difficult to imagine what the world was like without the Internet. This might seem to be a humorous overstatement to those of us who have lived through the transition. But to future generations, immediate future generations, a pre-Internet world will seem as remote as the time before computers or jet air travel seems to us. Even today, in its infant state, the Internet is the largest library, bookstore, auction house, and art gallery in the world. No human can possibly digest it all. A metasearch on Vincent van Gogh turns up 34 110 sites with pertinent information;...